Answer
There are 5 subshells.
Work Step by Step
Electron states with the same values of quantum numbers $n$ and $l$ form a subshell.
For any value of $n$, the values of $l$ can be $l = 0, 1, 2,...,(n-1)$
When $n=5$, then the values of $l$ can be $l = 0, 1, 2, 3, 4$
There are 5 subshells.
